Hot blast stove



Jan. 9, 1934'. F. R. M GEE HOT BLAST STOVE Filed March 14, 1932.

' .bwenior: FEANK E. W655,

\ g chamber-3 above the checkerwork 1.

Patented Jan. 9, 1934 PATENT OFFICE 4 no'r nms'r. s'rovE Frank R. McGee, Steubenvllle, Ohio Application March 14, 1932. Serial No. 598,834 8 Claims. (Cl. 263-19) This invention relates to hot-blast stoves, one of the objects being to provide quick initial ignition of the gases introduced to a stoves combustion chamber during its heating cycle. Another 5 object is to cause a complete combustion of these gases before they reach the brick checkerwork in these stoves whereby the latters life is prolonged. Qther objects will be understood from the following description. Having reference to the accompanying drawing, which illustrates a specific example of a hotblast stove constructed according to this invention, Figure 1 is a cross-sectional side elevation and Figure 2 a cross-section on the line II- -II or 5 Figure 1. v

The drawing shows a single-pass hot-blast stove that includes the usual brick checkerwork 1 positioned in-a refractory lined casing 2. The casing 2 is constructed to provide a combustion This combustion chamber 3 has a cylindricalrecess 4, a hot-blast conduit or main 5 leading from the end of this recess and gas inlets 6 being arranged in its sides. The products of combustion from 5 the chamber 3 pass down through the brick checkerwork 1 and through an outlet '7. 7

When the brick checkerwork is hot a blast is blown up through it by means of a compressed air pipe 8, the hot-blast being carried through the conduit 5 to a furnace. After the blast has been blowing some time the brick checkerwork becomes cooledto a point where it becomes necessary to reheat it. This is generally done by mixing air and gas together in the chamber 3, the initial ignition of this mixture depending on the heat retained by this chambers lining. This ignition will naturally occur more easily after the incoming air is heated. This is done by proyidingan air inlet 9 for the conduit 5' at a point remote from the chamber 3, this conduit having a cut-out valve 10 immediately beyond this inlet. At the beginning of the stoves heating cycle this valve 10 is closed and the air from the inlet 9 blown through a considerable length of the conduit 5. This conduit, being necessarily lined with refractory material, retains the heat from the hot blast blown through it for a considerable length of time, the air consequently being materially heated by passage therethrough and producing the desired result. Also, when the valve 10 is closed a column of the outgoing hot blast is trapped in the conduit 5. This intensely heated air further insures an immediate spontaneous combustion of the gases in the chamber 3.

The air stream coming from the conduit 5 into the chamber 3 is at right angles to the gas streams coming from the gas inlets 6 so that the two gases mutually impinge. This also aids initial combustion and, in addition, insures complete combustion of the gases in the chamber 3 before 0' they reach the brick checkerwork 1.

Otherwise than-has been described, the operation of the stove follows customary practice. The gas inlet 6 communicates with the gas main 12 through a valve 13, and the outlet 7, air jet 8 5 and air inlet 9 are all'provided with valves 14 for obvious reasons.

Although this specific form of hot blast, stove has been shown and described in accordance with the patent statutes it is not intended to limit the scope of the invention exactly thereto, except as defined by the following claims.

I claim:

1. A hot-blast stove including brick checkerwork, a combustion chamber for heating. said checker-work, a hot-blast main leading from said chamber, means for closing said main at a remote point from said chamber, means for passing air through said main to said chamber while said first named means is closed andmeans so for introducing combustible gases to said combustion chamber.

2. A hot-blast stove including a combustion chamber, ahot-blast main leading from said chamber, one or more gas inlets in said chamber adjacent the' mouth of said main and at right angles thereto, means for closing said main at a point remote from said chamber and means for introducing air to said main at a point adjacent said closing means when the latter is closed.

3. A stove including a regenerator, a combustion chamber communicating with said regenerator, a hot-blast main communicating with said chamber, means for introducing fuel to said chamber, a valve interposed in said main at a point remote from said chamber and means for introducing air to said main adjacent said valve when the latter is closed- 4. Themethod of operating a stove having an intercommunicating hot-blast main and com bustion chamber, which includes the acts of closing said main at apoint remote from said chamber and introducing the latters air for combustion through the former.

5. The method of operating a stove having an intercommunicating hot-blast main and combustion chamber, which includes closing said main at a point remote from said chamber and introducing air into the main at substantially 110 atmosphericaily normal temperature. said air being introduced at a point sumciently remote from said chamber to effect a heat exchange with said main sumcient to materially heat said air as it passes therethrough.

6. A single-pass, hot-blast stove including a checkerwork, a-combustion chamber above said checker-work and having a recess in its upper portion, and means for introducing mutually impinging air and gas to said recess.

7. A single-pass, hot-blast stove including a checkerwork, a combustion chamber above said checkerwork and having a recess in its upper portion, a hot-blast main opening into the upper portion of said recess and extending therefrom outside of the furnace, means for closing said main, means for introducing air to said main between the first named means and said recess. and means for introducing gas to said recess at an angle to air coming through and irom said main.

8. A single-pass, hot-blast stove including a checkerwork, a combustion chamber above said checkerwork and having a recess in its upper portion, a hot-blast main opening into the upper portion oi said recess and extending therefrom outside of the furnace, means for closing said main, means for introducing air to said main between the first named meansland said recess, and means for introducing gas'to said recess at an angle to air coming through and from said main, the first and second named means being at a point remote from said recess whereby the air introduced by the second named means and coming through said main can absorb heat therefrom to aid initial ignition in said chamber.

FRANK R. McGEE. 

